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    <meta charset="UTF-8">
    <title>智能医疗系统</title>
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<body>
<nav class="navbar navbar-expand-lg navbar-dark bg-primary">
    <a class="navbar-brand" href="#">智能医疗系统</a>
    <div class="collapse navbar-collapse">
        <ul class="navbar-nav me-auto">
            <li class="nav-item"><a class="nav-link" href="index.html">首页</a></li>
            <li class="nav-item"><a class="nav-link" href="login.html">登录</a></li>
            <li class="nav-item"><a class="nav-link" href="register.html">注册</a></li>
            <li class="nav-item"><a class="nav-link" href="ai.html">AI问诊</a></li>
            <li class="nav-item"><a class="nav-link" href="message-board.html">留言板</a></li>
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</nav>
<div class="container mt-5 text-center">
    <h1>欢迎使用智能医疗系统</h1>
    <div class="row mt-5">
        <div class="col-md-4">
            <a href="login.html?role=patient"
               class="btn btn-lg btn-info btn-block">患者登录</a>
        </div>
        <div class="col-md-4">
            <a href="login.html?role=doctor"
               class="btn btn-lg btn-warning btn-block">医生登录</a>
        </div>
        <div class="col-md-4">
            <a href="login.html?role=admin"
               class="btn btn-lg btn-danger btn-block">管理员登录</a>
        </div>
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</div>
</body>
</html>
